Hot Shot's Secret LX4 Lubricity Extreme – 32 Fl Oz - Fuel System Protection – Lubricates and Protects Fuel Pump and Injectors – Prevents Wear and Damage – For Gasoline or Diesel Engines

My 2001 Silverado HD has a 100% stock 6.6L LB7 turbo diesel, manufactured before ULSD regulations were promulgated for the United States in year 2007. For years, my engine has had an idle lope, and which recently upon fill up at a Chevron-branded station became more pronounced and was accompanied with a steady blue smoke plume from the exhaust. I suspected that the fuel pressure regulator was not moving smoothly enough and causing the fuel rail pressure to bounce around outside of target values. Since ULSD does not have the lubrication properties of pre-ULSD fuel, I wanted to try a lubricity additive, beyond the Power Service Diesel Kleen I have used since day 1. So I bought a bottle of this Hot Shot's Secret LX4 Lubricity Extreme, and added 5 ounces to my 34 gallon fuel tank that was full. I allowed it to sit overnight, and ran the truck in park for 10 minutes the first day, then let it soak again overnight. I ran it again for 10 minutes the next day in park, and let it sit overnight. The third day I drove it. The surge was totally gone and replaced with a beautiful smooth steady idle, and the blue tailpipe smoke was also gone. The exhaust from the tailpipe is now totally invisible. It's my belief that the pre-2007 Duramax engines were not engineered for the lower lubricity of modern diesel fuel, and for me, this has product is a huge blessing. (I do think the major fuel manufacturers like Chevron are meeting formal lubricity standards, but not to the lubricity level that the Duramax design engineers had in mind in earlier years pre-2007). Unless something changes, I'll use it from now on in my Silverado. Terry Livingston, Mobile, AL

This was a replacement bottle and it arrived with globs of light-colored goo floating around inside. I learned from the company that when subjected to freezing temperatures in it's undiluted state (i.e. in the bottle vs. in 30 gallons of diesel fuel) the organic oils can essentially gel. I brought the bottle inside and in a few days all the organic oils went back into solution. Once they disappeared, I put the bottle back in the much colder garage and it looks just like a normal bottle of LX4. Apparently it must be subjected to very cold temps to bring the organic oils back out of suspension. Anyway, they were very quick to replace the original bottle and all is well!! Thanks Hot Shot's Secret!

I have a 2019 GMC Sierra Duramax L5P - I have been using this product for over 10,000 miles and wanted to provide some added protection for the fuel system and the injectors. I have noticed a small improvement in fuel economy and throttle response. I do a lot of towing and noticed an almost immediate improvement.

MPG went up. Must be good for my Cummins. Anything that is good for my Cummins is good for me.

I recently heard about the high cost of replacing the Bosh HP fuel pump and associated damage from a failure. I reached out and researched Hot Shot LX4, and decided to try it. Two tanks of fuel later I had a 3 Failed sensor alarms. 1) Turbo Boost Control Sensor, 2) Failed particulate mater sensor, 3) Exhaust gas Sensor. Coincidence ??? I'll never know. 2015 GMC 3500 Duramax 6.6 101,000 miles on her. Never a problem before.